Silfanah, Kofifah, and Septi Budi Sartika. “The Validity of Question Items on The Material of Animal and Plant Reproduction in 9th Grade Secondary School”. Proceeding International Conference on Lesson Study 1, no. 1 (October 12, 2023): 75–83. Accessed June 7, 2025. https://journal.umg.ac.id/index.php/icls/article/view/6519.